Should I do “catch and release”?

Personally I usually only do it in two different circumstances:

  1. ⁠During flow rolling

  2. ⁠When there is a huge skill discrepancy or I don't trust the partner to recognize submissions

(particular when using leg locks like the heel hook where the wrong reaction by defender can cause serious injury)

I'd highly recommend it for flow rolling. Helps you focus on developing your movement and transitions. Almost by definition, when flow rolling I'm not focusing on working submissions or a heavy pressure game.